Abstract

Diffraction-limited aspherical lenses for audiodisc systems have been produced in a high-precision lens replication process using UV-polymerizable coatings. The requirements and merits of this process are described. The optical performance of the lenses is determined by the accuracy of the replication process and the physical properties of the photopolymerized coating. The optical and mechanical behavior of the replication coating is examined in detail over a broad temperature range.

Figures (9)

Relative spectral power distribution of part of the emission spectrum of the Philips HPA 400 W, UV light source, and absorption spectrum of the photoinitiators BDMK and HCPK, solid and dashed line, respectively, in methanol (0.002 M).